2 replies to this topic

[shan]

Hi Everybody,

 

Is there any way to predict flash gas volume vs. the last sage water treatment vessel (water skimmer) operating pressure?  The specific question is if our water skimmer is operated at 10 psig and overboard discharge to sea surface at 0 psig, will the carried over hydrocarbon gas with the produced water create a hazardous scenario?   

[Erwin APRIANDI]

Hi Shan,

 

I don't think any environmental regulation will allow you to have a disssolved gas in your discharge water to the environmental, especially I will assumed that the gas that is still dissolved and may flash is a hydrocarbon gas.

 

By having this,you are actually creating a HC gas cloud which may accumulated and cause disaster.

 

My suggestion is to operate the water skimmer at atmospheric pressure and flash the gas even before the mixed liquid is going to the skimmer (i.e to have like a gas boot or degasser upstream of last stage water treatment vessel and make the fluid flow from the gas boot or degassser by gravity) and from the last stage water treatment vessel, to pump the water for discharge.

[a_tlaiba]

you can predict this by two ways

 

1- simulation

2- experiments in the lab   " more accurate"

 

then you can see how much hydrocarbons will be vented to the atmosphere and is this amount is safe or not and environmentally accepted or not

 

 

Regards

Edited by a_tlaiba, 29 October 2014 - 04:01 AM.